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Subject: Re: Hyper-V clock on KVM node - CLOUDSTACK-8978
To: dev@cloudstack.apache.org
References: <e92e52ab156540a1bf7c5abd69bc7816@ILLDCUC11.Intrinium.local>
From: Wido den Hollander <wido@widodh.nl>
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Date: Mon, 26 Oct 2015 17:05:36 +0100
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On 24-10-15 02:15, Josh Harshman wrote:
> Just looking for some feedback on this idea for an improvement.
> 
> 
> Currently, for any windows guest OS, we set RTC for the clock source. This seems to contribute to clock-drift issues leading to BSODs on Windows Server 2008 R2 Guests.
> 
> I believe a possible improvement would be to set Windows guests to use the hyper-v clock. To do this we will need CloudStack to generate the appropriate Libvirt XML which would look somewhat like the following:
> 
> <features>
> <hyperv>
> <relaxed state='on'/>
> <vapic state='on'/>
> <spinlocks state='on' retries='8191'/>
> </hyperv>
> <features/>
> <clock ...>
> <timer name='hypervclock' present='yes'/>
> </clock>
> 
> 
> I believe the following code snippet from LibvirtComputingResource.java could be a starting place to implement this.
> 
> 
> if (vmTO.getOs().startsWith("Windows")) {
> clock.setClockOffset(ClockDef.ClockOffset.LOCALTIME);
> clock.setTimer("rtc", "catchup", null);
> 
> 
> Let me know what you all think about this change.
> Is there a better place / way to implement this?
> 

That would indeed be the place to fix this. It's currently rather
hardcoded, but that would be the place to go.

Wido

> 
> 
> 
> 
> Josh Harshman
> 
> Cloud Engineer
> Security+
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